Plasma’s restore session functionality has started working for me relatively recently, but there’s one thing that bugs me: all my windows are just dumped together into the same activity and workspace I’m in at login, so it becomes a big mess.
Is there a setting somewhere that tells it to respect the last position of the windows?
I have simply created custom rules for the respective programs and the associated open windows. Since these are standard programs anyway, which I always have open or want to open again on the same activity with the same arrangement. So I set up one for gaming, Internet, multimedia and work. This works without any problems.